private void loginPageButton_Click(object sender, EventArgs e)
        {
            //LoginFormUI obj=new LoginFormUI();
            //obj.Show();
            //this.Close();

            LoginFormUI obj = new LoginFormUI();

            obj.Show();
            obj.StartPosition = FormStartPosition.CenterScreen;
            this.Close();
        }
        private void backToLoginButton_Click(object sender, EventArgs e)
        {
            DialogResult dr = MessageBox.Show("Are you want to lock your application !!!", "continue", MessageBoxButtons.YesNo, MessageBoxIcon.Question);

            if (dr == DialogResult.Yes)
            {
                LoginFormUI obj = new LoginFormUI();
                obj.Show();
                obj.StartPosition = FormStartPosition.CenterScreen;
                this.Close();
            }
            else if (dr == DialogResult.No)
            {
            }
        }